Thermostatic carburetor choke device



Jan. 16, 1934. K. N. WILLMORE ET AL THERMOSTATIC CARBURETOR CHOKE DEVICE Filed Sept. 26, 1931 u Lw FKL n EL m w K n MCP' 6 Saw Msc Man w 2 m I 30' on line 2-2 of Figure 1.

Patented Jan. is, 1934 PATENT?- OFFICE 1,943,935 rnEnMos'rA'rm' CARBURETOR CHOKE DEVICE Knight N. Willmore and Arch P. Carroll, Fairfax,

and Carl 0. Stucker, Ponca City, Okla.

Application September 26, 1931 Serial No. 565,368

4 Claims. (01.123-119) This invention relates to an improved apparatus for choking or fuelizing an internal combustion engine or motor, and has for its object the production of a simple andefiicient means for automatically controlling the choke after the starting of the engine without the necessity of manually actuating a choke valve.

Another object of this'invention is the production of a' simple and efficient choking device for an internal combustion motor, which is' applicable to automobiles, trucks, busses, motor: boats, etc., and one of the primary objects of this invention is the production of a simple and eflicient thermostatically controlled valve mounted in communication with the exhaust manifold or exhaust pipe of the engine whereby theheat passing through the exhaust pipe or exhaust manifold will automatically actuate the choke valve to automatically open the choke valve at the predetermined temperature.

Other objects and advantages of the present -invention will appear throughout the following specification and claims.

In the drawing: Y Figure 1 is'a side elevation of anvexplosive engine showing the carburetor and means cooperating with the exhaust manifold for actuating the choke valve. Figure 2 is an enlarged sectional view taken Figure 3 is asectional view taken on line 3-3 of Figure 2. r By referring to the drawing it will be seen that 1 designates the internal combustion enas-gine or any suitable or desired type having an exhaust'manifold pipe 2 and an exhaust discharge pipe 3. Secured to and communicating with the exhaust manifold pipe 2 is a thermostatically controlled valve containing casingii, within which casing 3 is mounted a thermostatically' controlled butterfly valve 4, as clearly shown in Figure 2 and'3 of the drawing. This butterfly valve 4 is conected at one en to a spiral tapering coil 5, which spiraltapering coil 5'is preferably formed of acplurality of coils of sheet metal having a high coefiicient of expansion. The end of the tapering thermostatic coil 5 is hingedly secured in any suitable or desired manner as-at 6 to one side of the thermostatically controlled butterfly valve 4. This thermostatic tapering coil 5 is carried upon a journal pin 7, which journal pin 7 is carried V by the thermostatic coil supporting 'frame 8.

This frame 8 comprises a pair of parallel side arms 9, which are secured at their extremity, by

means of suitable fastening screws 12 to the sides-.of the casing 3, as clearly shown in Figures 2 and 3 of the, drawing.

The opposite ends of the arms 9 are connected by means of a circular head 11, which is provided with a centrally located aperture 12. This frame 8 constitutes an efficient support for the thermostatic coil spring 5 and the aperture 11 will permit the passage of the exhaust gases freely through the casing 3 without obstruction. The casing 3 is provided with a flexible tube of any suitable or desired structure indicated by the numeral 13 which in turn is connected at its discharge end to the exhaust discharge pipe 7 3,. 0 As shown in Figure 1 the carburetor 14 is connected to the intake manifold 15 of the engine 1 and this carburetor 14 'carries a, choke valve 16 of the usual type, which choke valve 16 is actuated by means of an actuating arm (5 17 secured thereto and extending upon the outer face of the carburetor 14 as is usual with such type of operating arm. This choke valve op-' erating arm 1'1 is connected to an operating link 18, which link also is connected to an operating arm 19 carried by the supporting shaft 20 of the thermostatically controlledjbutterfly valve The operation of the device is as follows:-

As soon as the engine is started, heat will naturally pass through the exhaust manifold pipe 2 through the'medium of the exhaust gases passing from the cylinders of the engine, and

the heat will then pass into the casing 3 and longitudinally thereof, and out through the discharge pipe 13 into the exhaust discharge pipe 3'. The heat from the exhaust gases will cause the thermostatic coil spring 5 to expand, and as the heat'increases and the coil spring 5' continues to expand or lengthen, the valve 4 will'be I forced to a closed position in the direction of the arrows shown in Figure 3, thereby moving the choke valve to a fully opened position and the heat control valve will remain closed, thereby protecting the thermostatic element against excessive heat. When the engine is turned off, and the exhaust gases no longer pass through the exhaust manifold 2, the thermostatic coil spring 5 will retract and again open the thermostatically controlled butterfly valve 4 and close the ,choke valve 16 or move the same to the position shown in Figure 1. When the engine is stopped, the parts naturally return to, their respective positions occupied at the start in the length of time proportionate to the temperature of the air and the consequent temperature of the engine.

From the foregoing description it will be seen that a very simple and eflicient means has been produced, for properly fuelizing or choking the engine at all times and for automatically controlling the opening and closing of the choke valve. Through the medium of the connecting link 18 the choke valve 15 will be opened and closed proportionately in their respective movements to the butterfly valve 4. This action will cause a proper and gradual control of the fuel passing from the carburetor into the engine.

It should be understood that certain detail changes in mechanical construction may be employed without departing from the spirit of the for automatically opening and closing said choke valve as said thermostatically controlled valve is actuated within said casing.

2. A choke control device for an internal co'mbustion engine comprising a casing adapted to be secured to the manifold of an engine, said casing provided with a means for connecting to the exhaust pipe of a manifold of an engine, a butterfly valve mounted within said casing, a thermostatic coil spring mounted within said casing and engaging said butterfly valve for closing said butterfly valve as said coil spring expands, and an arm connected to said butterfly valve and adapted to be engaged with the choke valve of a carburetor for opening the choke valve of a carburetor when said butterfly in said'casing is closed. J

3. A device of the class described comprising a casing, a butterfly valve journaled in one end of said casing, a frame mounted within said casing, a thermostatic tapering coil spring anchored upon said frame and engaging one end of said butterfly valve, whereby said butterfly valve will be forced to a closed position as said tapering thermostatic spring expands, and an arm carried by said butterfly valve and adapted to be secured to a choke valve of the carburetor of an engine for opening the choke valve as said butterfly valve is moved to a closed position.

4. A device of the class described comprising a casing adapted to communicate with an exhaust manifold of an engine, a butterfly valve mount- "ed therein for swinging movement, a thermostat supporting frame secured to the inner face of said casing and comprising a plurality of parallel arms, means for anchoring one end of said arms to said casing, a head connecting the other ends of said arms and being-provided with a centrally located aperture to permit the passage of exhaust gases to said casing unobstructed, a discharge pipe connected to said casing and A adapted to communicate with the discharge pipe of an exhaust manifold, and an operating arm connected to said butterfly valve and adapted to cooperate the choke valve of the carburetor for opening and closing the same.

' KNIGHT N. WJLLMORE.

ARCH P. CARROLL. CARL O. STUCKER. 

